by PeakOiler » Mon 07 Nov 2005, 21:27:00
$this->bbcode_second_pass_quote('PeakOiler', ' ')I measured the power usage of my office Dell computer and monitor running Windows2000 with the Kill-A-Watt meter.
There are about 2000 Dell computers at my employer. If we can get all the employees to use the "Power Options" feature (located in the Control Panels) and get all the employees to power down either when they're away from their comp, (like out to lunch), and also get everyone to turn off their PC overnight and over the weekends, we may save the agency a lot of dollars. I hope I get recognized for my energy conservation tip at work.
I received this reply at work:
"James,
Subject: proposed December Hints from Heidi
Following is my proposed Hints for the December employee newsletter.
The submittal deadline is 11/15. I have permission from James to
identify him in the column. I have spoken with Gary in IR about
the content of this piece. I have copied both of them in case they have any additional feedback. +++++++Recently James sent me an e-mail about the energy used by our computers even when they are off.
He used a "Kill-A-Watt" meter to measure the energy usage on his
computer. He found that his computer used the following: 116 to 170 watts when it was in use depending on what applications were running; 40 watts when it was in Power Save mode; and 4 to 5 watts when the computer was off but the monitor was on.
James wondered how much it cost the [agency] to have the computers off but the monitors on, on nights and weekends. In Feb., 2005, there were 4,156 monitors at the agency. So here's the math*: Cost of electricity = $0.034/kWh (By the way, the [agency] buys 100% green energy.) Hours computer is off but monitor is on = 123 (75 + 24 + 24) 15 hours per night x 5 nights = 75 hours 24 hours on Saturday 24 hours on Sunday.
Watts used when monitor only is on = 4.5 ((4+ 5) / 2 = 4.5) (4156 computers x 4.5 watts x 123 hours/week x 52 weeks)/ 1000 = 119,618 kWh 119,618 kWh x $.034/kWh = $4,067.00 per year.
The agency also pays to cool the heat generated by the monitors. Information Resources uses a factor of 1.3 to calculate the cost of the additional cooling. $4,067.00 x 1.3 = $5,287.10 per year So when you leave for the day or to go to a long meeting, turn off your computer AND your monitor. The monitor has to be turned off separately. DO NOT CHANGE THE POWER OPTIONS ON YOUR COMPUTER. This can mess up files you may have open, especially databases. If you don't know how to change the power options, never mind. If you do, leave them alone. Thanks for helping the [agency] save energy and money.
*This is an approximation based on the best available data. I realize that people are on different schedules and some computers, like servers, are never off, so the calculations aren't perfect."
